computeDistanceHaversine function
Compute distance between 2 points according to Haversine formula.
Implementation
num computeDistanceHaversine(
LatLng p1,
LatLng p2, {
num radius = earthRadius,
}) {
final sDLat = sin((degToRad(p2.lat) - degToRad(p1.lat)) / 2);
final sDLng = sin((degToRad(p2.lng) - degToRad(p1.lng)) / 2);
final a = sDLat * sDLat +
sDLng * sDLng * cos(degToRad(p1.lat)) * cos(degToRad(p2.lat));
final c = 2 * atan2(sqrt(a), sqrt(1 - a));
return radius * c;
}